Not a sprocket only, but you can buy a 23-tooth freewheel that should fit.
Yes
Yes, they Are Bmx Bikes. I Do Not Recommend Them Thought.
Yes
No. a 9T sprocket will only fit a cassette hub, and not freewheel hubs.
The Mongoose Rebel Is a 20" Freestyle Bmx Bike
It will if you have bmx (or bmx style) cranks.
change out the hub
A 25-tooth sprocket on a BMX bike typically pairs with a 9-tooth rear driver or cog, which is common for BMX setups. This combination provides a good balance of acceleration and top speed, making it suitable for street and park riding. However, riders may choose different tooth combinations based on their riding style and preferences.
Yes its a fantastic bike and great for tricks
the easiest way is to go to your local bike shop
Some popular BMX bike brand logos include GT, Haro, Mongoose, and Redline.
If you want a cheap bike mine as well go for a mongoose